Once upon a time, I worked for an airline (now a 'regional loco) that bought a few stretched biz-jets for commuter use and employed several ex biz-jet pilots to help fly them. The word from HQ was that they did not settle in particularly well. To be honest I had several 'interesting' conversations with some of them which did not endear me to their cause. I don't believe airline or exec flying to be any more difficult than the other. They are just different and some people adapt to change better than others. I'd love a go at exec flying but I realise it is very different in certain aspects. I have several friends flying bizjets, all of whom are ex airline. Some love it, some don't. The bottom line is we are all pilots..lets respect each other's area of expertese.